Illustration Photo: ORNL's Charles Seipp synthesized a simple compound known as guanidine that was found to bind strongly with carbon dioxide directly from the air and form insoluble carbonate crystals that are easily separated from water. (credits: Oak Ridge National Laboratory / Flickr Creative Commons Attribution-NonCommercial-NoDerivs 2.0 Generic (CC BY-NC-ND 2.0))

Illustration Photo: ORNL's Charles Seipp synthesized a simple compound known as guanidine that was found to bind strongly with carbon dioxide directly from the air and form insoluble carbonate crystals that are easily separated from water. (credits: Oak Ridge National Laboratory / Flickr Creative Commons Attribution-NonCommercial-NoDerivs 2.0 Generic (CC BY-NC-ND 2.0))